一组数据的方差怎么算

大众传播的基本模式先谢谢了! The clothes in Mary's Clothes Store are expensive.can 后面的动词用ing形式还是用原形 英语填空.A：What can I do for you?B:I"m_____for a sweater. what can i do f____ you?(英语填空） 英语What is the man _____ (do) 我有任务,帮个忙回答一下 He can help us with our English 同义句替换 太阳老化后会吞噬地球吗? 地球为什么会衰老 为什么太阳会衰老? 英语翻译 英语翻译Customer:Who is speaking?Tuff office staff:My name is Doris/Mei l'm a customer service executive can l help you?Tuff office staff:This is Mei from Tuff lndustriesCould you tell me which company you are calling from?Could you tell me if yo 请帮我回答：有名的大众传播模式及其各自的特点这位同志回答一点也不对的,不是专业的,我要的是专业的答案.比如说是 施拉姆模式 信息有什么特点? Tom's room is very ( ) 以d开头 亲们,大学英语作文 what can i do on the internet是大学作文哦,亲们, 英语,作文.what can you do on the internet300到500个词大概要说5分钟…下午一点之前要,老师评价好的话加分啊 what can you do on internet英语作文初一水平 50个词没有用到过去式~~ The book I ___ on the book _____there ever since Alaid…has been lying B had beenB had laid …laid Claid…have been laid Dput…has laid Miss Gao is a good teacher.She is very s____ with us. We went to the zoo, we have to feed the fish, fiWe went to the zoo, we have to feed the fish, fish swimming in the water. here the elephant, the elephant is running. the elephant in the side of the tiger, The tiger in the sleeping. the monkey 速求英语周报高二人教修订版湖北专版 35期 unit19答案~ 高二英语周报,人教课标版＊福建专版.第三期答案,第五版和第六版第三期哦,life in the future那期 person是可数名词吗?单用时候是单数还是复数?有什么特殊用法? person的复数是什么 He looked at the bits of wood and metal around him.A.laying B.laid C.lying D.lied请问下这个题到底该选什么啊?理由是什么呢?我看完了以后被这两个词弄郁闷了! he looked at the bits of wood and metal around himHe looked at the bits of wood and metal ________around him A、laying B、laid C、lying D、lied选哪个?为什么? he glanced at the bits of wood and metal.he ( ) the bits of wood and metal1 looked quickly at 2 had a glimpse of 3 was destroyed 4 was damaged请问选择哪个,分别说出为什么 glancing at the bits of wood and metal that lay around him1.lay around him 2.glancing at 是动名词做主语吗?it crashing into the courtyard below 为什么crashing加ing不加不可以吗？ 英语作文Nowadays,many families have only one child 英语作文 If I have only one day to live 怎么写? 如何教学初中英语中的名词单复数 there was a book and two pens lying on the table为什么用was而不用were